Q: Which of the following is the correct dimensional analysis setup to convert $$25.0\ \mathrm{in} to $$centimeters? ($$1\ \mathrm{in} = 2.54\ \mathrm{cm})$$

$$25.0\ \mathrm{in} \times \frac{2.54\ \mathrm{cm}}{1\ \mathrm{in}}$$

Question 1

Which of the following best describes a hypothesis in the scientific method?

Accepted Answer

A tentative explanation that can be tested by experiments.

Question 2

A student measures the mass of a metal sample as $$12.34\ \mathrm{g}$$ and its volume as $$4.1\ \mathrm{cm}^3. $$What is the density of the metal, reported to the correct number of significant figures?

Accepted Answer

$$3.0\ \mathrm{g/cm}^3$$

Question 3

Which of the following is a qualitative measurement?

Accepted Answer

The solution turned blue after adding the reagent.

Question 4

Convert $$0.00567 to $$scientific notation.

Accepted Answer

$$5.67 	imes 10$$^{-3}$$

Question 5

A patient’s body temperature is measured as $$39.0\ ^\circ\mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$312.2\ \mathrm{K}$$

Question 6

Which of the following is the correct conversion factor to change centimeters to meters?

Accepted Answer

$$1\ \mathrm{m} = 100\ \mathrm{cm}$$

Question 7

A block of wood has a mass of $$250\ \mathrm{g}$$ and a volume of $$400\ \mathrm{cm}^3. $$Will it float or sink in water? (Density of water = $$1.00\ \mathrm{g/cm}^3)$$

Accepted Answer

It will float because its density is less than water.

Question 8

Which of the following is NOT a derived SI unit?

Accepted Answer

$$\mathrm{meter}$$

Question 9

A car travels $$120.0\ \mathrm{km} in$$ $$2.00\ \mathrm{h}. $$What is its speed in $$\mathrm{m/s}$$?

Accepted Answer

$$16.7\ \mathrm{m/s}$$

Question 10

Which of the following best defines accuracy in a set of measurements?

Accepted Answer

How close a measurement is to the true value.

Question 11

A sample of gasoline has a density of $$0.74\ \mathrm{g/cm}^3. $$What is the mass of $$2.50\ \mathrm{L} of $$gasoline? ($$1\ \mathrm{L} = 1000\ \mathrm{cm}^3)$$

Accepted Answer

$$1850\ \mathrm{g}$$

Question 12

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 13

A measurement is recorded as $$0.004560 g. $$How many significant figures does it have?

Accepted Answer

4

Question 14

A nurse needs to convert a patient's weight from pounds to kilograms. If the patient weighs $$154\ \mathrm{lb}$$, what is the weight in kilograms? ($$1\ \mathrm{kg} = 2.205\ \mathrm{lb})$$

Accepted Answer

$$69.8\ \mathrm{kg}$$

Question 15

Which of the following is the best example of a quantitative observation?

Accepted Answer

The solution has a mass of $$12.5\ \mathrm{g}.$$

Question 16

A student records the following measurements for the length of a metal rod: $$12.01\ \mathrm{cm}$$, $$12.03\ \mathrm{cm}$$, $$12.02\ \mathrm{cm}. $$The actual length is $$12.50\ \mathrm{cm}. $$Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 17

Which of the following is the correct dimensional analysis setup to convert $$25.0\ \mathrm{in} to $$centimeters? ($$1\ \mathrm{in} = 2.54\ \mathrm{cm})$$

Accepted Answer

$$25.0\ \mathrm{in} 	imes \frac{2.54\ \mathrm{cm}}{1\ \mathrm{in}}$$

Question 18

A student calculates the area of a rectangle as $$12.345\ \mathrm{cm} 	imes 6.7\ \mathrm{cm}. $$What is the area, rounded to the correct number of significant figures?

Accepted Answer

$$83\ \mathrm{cm}^2$$

Question 19

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object; weight is the force of gravity on that object.

Question 20

A laboratory thermometer reads $$25.0\ ^\circ\mathrm{C}. $$What is this temperature in Fahrenheit?

Accepted Answer

$$77.0\ ^\circ\mathrm{F}$$

General Chemistry: Measurement, Units, and Scientific Method Study Notes

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